Air Flow theory - Pressurized
03-10-2010, 06:38 PM
#48
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Thread Starter
It's like taking a stock set of big block mopar heads and putting a dominator on the stock intake, use the stock cast iron exhaust manifolds, and stuff in a giant roller cam. Doesn't make sense to me.
Yet, I have done the same.
I'm going to practice what I preach, yank my head, do my own porting, cut off the intake log and make an intake manifold, and make an exhaust manifold. Then I think pump and turbo mods will yield much bigger gains.
03-14-2010, 10:40 PM
#50
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Got an exhaust manifold flange finished for mhuppertz custom manifold project. Turned out nice, just need to double check that everything will fit on a scrap head.
03-15-2010, 12:13 AM
#51
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I cant wait to see how this plays out... I love this kind of thinking... I still think (if money was no object) that stroking one of these engines would yield something fun as well!!!
03-15-2010, 11:58 AM
#53
Registered User
Something to add to your poderations. Equal length may not equal equal flow.
Decades ago I worked with and manufactured ultra high vacuum chambers used in the electronics and other high tech industries. A rule of thumb we used was every 90° bend equaled a 50% loss in flow. With that in mind, a shorter pipe could have less flow than a long pipe if it had more bends. This can be used to an advantage for a tighter package, but the more bends works against you overall.
Decades ago I worked with and manufactured ultra high vacuum chambers used in the electronics and other high tech industries. A rule of thumb we used was every 90° bend equaled a 50% loss in flow. With that in mind, a shorter pipe could have less flow than a long pipe if it had more bends. This can be used to an advantage for a tighter package, but the more bends works against you overall.
03-15-2010, 12:14 PM
#54
Registered User
On the intake side, my thinking is along the lines of an air compressor. The larger the tank (think log), the longer it takes to refill (think lag). Runners are like air hoses not only adding volume to the tank, but also resistance to the flow. A smaller log (for balance), but equally fed from more than one point may be the ticket. Limits? If the size of the supply tubes and log are too long they introduce lag. If they are too small they introduce resistance to flow.
03-15-2010, 12:59 PM
#55
Registered User
There's nothing new here.
A wide variety of intake & exhaust manifold designs have been around as hard parts for years - many of them available for purchase.
Quality airflow is more expensive than quantity airflow; compounded compressors & excess fuel are "easy" ways to make power - but porting, re-valving, thermal coatings and long-branch individual runner manifolds cause the quantity to be of higher quality... often allowing the use of larger turbo(s) and heavier fueling through their concomitant increase in torque "under the curve", faster spoolup, higher mileage, better drivability, etc.
Of course, properly designed intake & exhaust tracts also increase peak power.
Whoever has the most molecules wins.
A wide variety of intake & exhaust manifold designs have been around as hard parts for years - many of them available for purchase.
Quality airflow is more expensive than quantity airflow; compounded compressors & excess fuel are "easy" ways to make power - but porting, re-valving, thermal coatings and long-branch individual runner manifolds cause the quantity to be of higher quality... often allowing the use of larger turbo(s) and heavier fueling through their concomitant increase in torque "under the curve", faster spoolup, higher mileage, better drivability, etc.
Of course, properly designed intake & exhaust tracts also increase peak power.
Whoever has the most molecules wins.
03-15-2010, 01:08 PM
#56
Registered User
I wish these guys would get their butts out of the mud.
http://www.coatesengine.com/csrv.html
http://www.coatesengine.com/csrv.html
03-15-2010, 04:43 PM
#57
1st Generation Admin
Quality airflow is more expensive than quantity airflow; compounded compressors & excess fuel are "easy" ways to make power - but porting, re-valving, thermal coatings and long-branch individual runner manifolds cause the quantity to be of higher quality... often allowing the use of larger turbo(s) and heavier fueling through their concomitant increase in torque "under the curve", faster spoolup, higher mileage, better drivability, etc.
Of course, properly designed intake & exhaust tracts also increase peak power.
Of course, properly designed intake & exhaust tracts also increase peak power.
03-15-2010, 09:18 PM
#58
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I wish these guys would get their butts out of the mud.
http://www.coatesengine.com/csrv.html
http://www.coatesengine.com/csrv.html
Plus there are motors out there that operate similar to that head, eliminating the pulsating all together, almost unlimited rpm and hp capability compared to a common gas motor. Low rpm Torque is the only problem because they are in the turbine family.
03-15-2010, 09:43 PM
#60
Registered User
Thread Starter
There's nothing new here.
A wide variety of intake & exhaust manifold designs have been around as hard parts for years - many of them available for purchase.
Quality airflow is more expensive than quantity airflow; compounded compressors & excess fuel are "easy" ways to make power - but porting, re-valving, thermal coatings and long-branch individual runner manifolds cause the quantity to be of higher quality... often allowing the use of larger turbo(s) and heavier fueling through their concomitant increase in torque "under the curve", faster spoolup, higher mileage, better drivability, etc.
Of course, properly designed intake & exhaust tracts also increase peak power.
Whoever has the most molecules wins.
A wide variety of intake & exhaust manifold designs have been around as hard parts for years - many of them available for purchase.
Quality airflow is more expensive than quantity airflow; compounded compressors & excess fuel are "easy" ways to make power - but porting, re-valving, thermal coatings and long-branch individual runner manifolds cause the quantity to be of higher quality... often allowing the use of larger turbo(s) and heavier fueling through their concomitant increase in torque "under the curve", faster spoolup, higher mileage, better drivability, etc.
Of course, properly designed intake & exhaust tracts also increase peak power.
Whoever has the most molecules wins.